您可以遍历数据集，但是无需在服务器上创建CSV文件，只需通过HTTP响应将其返回即可。以下功能可以解决问题。
Public Shared Sub ExportTextFile(ByVal response As System.Web.HttpResponse, ByVal text As String, ByVal fileName As String)
response.Clear()
response.addheader("content-disposition", String.Format("attachment;filename={0}", fileName))
response.Charset = ""
response.Cache.SetCacheability(HttpCacheability.NoCache)
response.ContentType = "application/vnd.text"
Dim stringWrite As New System.IO.StringWriter
Dim htmlWrite = New HtmlTextWriter(stringWrite)
response.Write(text.ToString)
response.End()
End Sub
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